Table 1: Sources falling in the RGS field of view with an EPIC flux more than 20% that of $\sigma$ Ori AB. Count rates are MOS equivalent count rates. Identified stars are all members or candidate members of the $\sigma$ Ori cluster.
N_x RA_x Dec_x Count rate Opt. ID Offset V B-V Sp. type

(2000) (cts/ks) ( $\hbox{$^{\prime\prime}$ }$ )

1 $5\>38\>44.86$ $-2\>36\>00.2$ $439.9 \pm 2.5$ $\sigma$ Ori AB 1.17 3.78 -0.24 O9.5V

2 $5\>38\>47.26$ $-2\>35\>39.9$ $199.4 \pm 1.7$ $\sigma$ Ori E 1.08 6.70 -0.18 B2Vp

3 $5\>38\>38.54$ $-2\>34\>55.5$ $138.8 \pm 1.4$ GSC 4771-1147 0.91 12.24 1.18 K5

4 $5\>38\>41.34$ $-2\>37\>22.3$ $107.2 \pm 1.2$ r053841-0237 0.82 K3

**Table 1:** Sources falling in the RGS field of view with an EPIC flux more than 20% that of $\sigma$ Ori AB. Count rates are MOS equivalent count rates. Identified stars are all members or candidate members of the $\sigma$ Ori cluster.
N_x	RA_x	Dec_x	Count rate	Opt. ID	Offset	V	B-V	Sp. type
	(2000)	(cts/ks)		( $\hbox{$^{\prime\prime}$ }$ )
1	$5\>38\>44.86$	$-2\>36\>00.2$	$439.9 \pm 2.5$	$\sigma$ Ori AB	1.17	3.78	-0.24	O9.5V
2	$5\>38\>47.26$	$-2\>35\>39.9$	$199.4 \pm 1.7$	$\sigma$ Ori E	1.08	6.70	-0.18	B2Vp
3	$5\>38\>38.54$	$-2\>34\>55.5$	$138.8 \pm 1.4$	GSC 4771-1147	0.91	12.24	1.18	K5
4	$5\>38\>41.34$	$-2\>37\>22.3$	$107.2 \pm 1.2$	r053841-0237	0.82			K3

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